Roll Out The Barrels, Your Majesty
The Queen was mistakenly sent 2,000 pints of beer when one of her royal residences was confused with a nearby pub. Royal staff had no record of any such order when a truck turned up at Windsor Castle, with 12 barrels of lager. A quick telephone call revealed the mistake - the booze had been destined for the Windsor Castle pub eight kilometres away.
FOOTNOTE: Pint-sized error.